Does anyone know the weight in pounds, per foot of 2"x4" rectangular steel, around .25 wall that could be used for a lightweight buggy frame?
Or even better, does anyone know of a chart that tells the weight of all kinds of steel, and different sizes, etc?

Thanks

2x4 .25" wall is rather heavy per foot! Just use 1.75" (or 1.5") .120 wall tube. As far as the weight goes, I an run over to my metal storage and weigh a piece.

Ok, I've just weighed two pieces of metal.
The first was a 2x4 .25 wall...It weighed about 12# per foot
The other was 1.75 .120 DOM...It weighed around 3# per foot (my scale isn't too accurate that low)

Give your local steel supplier a call. Their pricing is based on material weight. They should have a chart .

onlinemetals.com
Hot Roll Mild Steel Rectangle Tube A36
Dimensions
Dimension Name Value
Height 2"
Width 4"
Wall 0.25"

(Technical information is located at the bottom of the page)

Weight/lineal foot: 9.372 pounds

first multiply the area of the steel x the length then multiply x .283 and it will give you the weight. for aluminim i think it is .09 instead of .283

here is and example of the calculation outside volume 2x4=8 - inside volume 1.5x3.5=5.25 outside bolume minus inside volume 8-5.25= 2.75
area x length 2.75 x 12= 33 33 x .283 = 9.339 lbs

8.810 lbs. per ft.

Does anyone know the weight in pounds, per foot of 2"x4" rectangular steel, around .25 wall that could be used for a lightweight buggy frame?
Or even better, does anyone know of a chart that tells the weight of all kinds of steel, and different sizes, etc?

Thanks

Thats not going to be a LIGHTWEIGHT buggy frame. .120" should be more than enough.

I was going to use 2x4" steel for simplicity...when you said .120, are you talking about tube, or can I get 2x4" steel in .120 wall thickness too?
Obvisly this stuff is new for me, thanks for the help guys!

Yep, 4 X 2 X 1/8 = 4.750 lbs. per ft.

I was going to use 2x4" steel for simplicity...when you said .120, are you talking about tube, or can I get 2x4" steel in .120 wall thickness too?
Obvisly this stuff is new for me, thanks for the help guys!

Sorry, I was a little unclear. You can get 2x4 in .120" wall; and thats what I was referring to. A good choice Id say because it is easy to work with like you said and will be very strong. Depending on the weight of this buggy your planning on building you may be able to use a slightly thinner wall than .120", depending on whats available.

What's crossing the line for weight of a rig for the thickness of 2x4" steel? I'll probably get .120, like you said. I don't know the weight it will be because I'm comparing the budget, to parts right now. Whats the next size down from .120 that would be "easy" to get, and still be strong enough?

Just bought some 3"x4" x .120" for my rear frame and breifly looked at what else was available. Looks like .120" would be the easiest to get a hold of and will work just fine for your application.